VPN Tunnel Slows down internet speed????

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by Flynlow, Dec 2, 2007.

  1. Flynlow

    Flynlow LI Guru Member

    I have a VPN tunnel setup between two Linksys WRV54G routers. The connection using the VPN works fine and I am able to get my data the way I should be able to from one location to the other. The problem is a lot of the time my internet speed drops off to around 125K but then goes back up to 3megs a few minutes later then go back down. I know the problem is with the VPN b/c if I disable the VPN setting I have NO problems with internet speed at all. I have chaged the MTU size to EVERY number you can think of. I have just the VPN tunnel setup no VPN client or anything to do with ports. I have also rules out a problem with the DNS.

    These are my VPN Tunnel settings.

    IPSec Pass-through: Enabled
    PPTP Pass through: Enabled
    L2TP pass-through: Disabled (also tried it enabled)
    IP Range of Local secure group:
    IP Range of Remote Secure Group:
    Remote Secure Gateway : External IP address of other location
    Encryption: 3DES
    Authentication: MD5
    Key Exchange Method: Auto (IKE)
    PFS: Enabled:
    Pre-Shared Key: (Matches other location)
    Key Lifetime: 28000

    Advanced VPN Tunnel Setup:
    Phase 1:
    Operation Mode: Main
    Encryption: DES
    Authentication: MD5
    Group 768-bit
    Lifetime Key: 3600

    Phase 2:
    Encryption: 3DES
    Authentication: MD5
    PFS: Enabled
    Group 768-bit
    Key lifetime: 28000
    Keep Alive
    If IKE failed more than 5 times block for 60 seconds
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